TWP/MMCR/C3 - Diminished Reflectivity Sensitivity

Radar sensitivity was diminished by approximately 15 - 20 dBZ during
this period.  The result is that upper level cloud tops may be missed
and thin clouds, particularly thin cirrus, may not be detected during
this period.  Reflectivity was correctly calibrated, so values are
correct where signals were detected.  The problem was caused by
lightning damage to the low noise amplifier (LNA).  The LNA was replaced
on 20060718.

• First Order Estimate of Spectral Count Calibration(CalibrationConstant)
• Radar Constant(RadarConstant)
• Receiver Gain(RxGain)
• Receiver Sky Noise(SkyNoiseLevel)
• Minimum detectable reflectivity(MinimumDetectableReflectivity)
• Receiver 290K Level(Rx290KLevel)
• Receiver Cal Check Level(CalCheckLevel)

• Receiver Sky Noise(SkyNoiseLevel)
• Receiver Cal Check Level(CalCheckLevel)
• Minimum detectable reflectivity(MinimumDetectableReflectivity)
• Range Corrected Calibrated Power(RangeCorrectedPower)
• Receiver 290K Level(Rx290KLevel)
• MMCR Reflectivity(Reflectivity)
• Radar Constant(RadarConstant)
• Receiver Gain(RxGain)

TWP/MMCR/C3 - Reprocess:   Height Error

A timing error was found in the PIRAQ MMCR's.  It resulted in recorded heights being too 
high for each radar mode by the following amounts: 
   Mode 1: 24.8756 m too high
   Mode 2: 25.6249 m too high
   Mode 3: 33.1176 m too high
   Mode 4: 33.1176 m too high
Range gate spacing was not affected.

• Height of Center of Each Range Bin(Heights)

• Raw data stream - documentation not supported(raw)

• Array of heights for each power(heights)

TWP/MMCR/C3 - Receiver switch lock-up

During the troubleshooting of another intermittent problem, a receiver switch latched up 
in an open position making the data unusable.

• First Order Estimate of Spectral Count Calibration(CalibrationConstant)
• Elevation(Elevation)
• Radar Constant(RadarConstant)
• Height of Center of Each Range Bin(Heights)
• Receiver Gain(RxGain)
• Number of Points in FFT(NumFFT)
• Azimuth(Azimuth)
• Gate Spacing(GateSpacing)
• Data Quality Status(DataQualityStatus)
• Inter-Pulse Period(InterPulsePeriod)
• Max. height of clutter removal(ClutterHeight)
• Pulse Width(PulseWidth)
• Spectral Data(Spectra)
• radar mode char identifier(ModeDescription)
• Time offset of tweaks from base_time(time_offset)
• base time(base_time)
• Receiver Mode(ReceiverMode)
• Number of Spectral Averages(NumSpectralAverages)
• Minimum detectable reflectivity(MinimumDetectableReflectivity)
• Receiver 290K Level(Rx290KLevel)
• Windowing ON-OFF Status(WindowingONOFF)
• Dummy altitude for Zeb(alt)
• Current Receiver Number(ReceiverNumber)
• RadarWaveLength(m) / [4 * InterPulsePeriod(s) * NumCoherentIntegrations](NyquistVelocity)
• DC Filtering ON-OFF Status(DCFilterONOFF)
• Operating Set for this Record(ModeNum)
• lat(lat)
• lon(lon)
• Receiver Cal Check Time Stamp(CalCheckTime)
• Number of Receiver(NumReceivers)
• Number of Code Bits(NumCodeBits)
• Number of Gate Heights(NumHeights)
• Delay to First Range Gate(StartGateDelay)
• Receiver Sky Noise(SkyNoiseLevel)
• Receiver Cal Time Stamp(RxCalTimeStamp)
• Number of Coherent Integrations(NumCoherentIntegrations)
• Receiver Cal Check Level(CalCheckLevel)

• Raw data stream - documentation not supported(raw)

• Delay to First Range Gate(StartGateDelay)
• Gate Spacing(GateSpacing)
• Array of heights for each power(heights)
• Signal to Noise Ratio(SignalToNoiseRatio)
• lon(lon)
• Max. height of clutter removal(ClutterHeight)
• Receiver Sky Noise(SkyNoiseLevel)
• Mean Noise Level(NoiseLevel)
• Minimum detectable reflectivity(MinimumDetectableReflectivity)
• lat(lat)
• Time offset of tweaks from base_time(time_offset)
• Number of Points in FFT(NumFFT)
• MMCR Spectral Width(SpectralWidth)
• Range Corrected Calibrated Power(RangeCorrectedPower)
• Receiver 290K Level(Rx290KLevel)
• TWT Status Code, details forthcoming from MMCR vendor(TWTStatusCode)
• Current Receiver Number(ReceiverNumber)
• MMCR Reflectivity(Reflectivity)
• Receiver Cal Time Stamp(RxCalTimeStamp)
• Radar Constant(RadarConstant)
• Receiver Mode(ReceiverMode)
• Inter-Pulse Period(InterPulsePeriod)
• Peak tranmitted power, averaged over the course of the hour(PeakTransmittedPowerAvg)
• RadarWaveLength(m) / [4 * InterPulsePeriod(s) * NumCoherentIntegrations](NyquistVelocity)
• Number of Receiver(NumReceivers)
• radar mode char identifier(ModeDescription)
• Operating Set for this Record(ModeNum)
• Windowing ON-OFF Status(WindowingONOFF)
• Number of Code Bits(NumCodeBits)
• MMCR Mean Doppler Velocity(MeanDopplerVelocity)
• Number of Coherent Integrations(NumCoherentIntegrations)
• Number of Gate Heights(NumHeights)
• Dummy altitude for Zeb(alt)
• DC Filtering ON-OFF Status(DCFilterONOFF)
• time(time)
• Receiver Gain(RxGain)
• base time(base_time)
• Time associated with hourly averaged values(TimeAvg)
• Circular Depolarization Ratio(CircularDepolarizationRatio)
• Average Noise Level (S/N<0)(AvgNoiseLevel)
• Receiver Cal Check Level(CalCheckLevel)
• Number of Spectral Averages(NumSpectralAverages)
• Pulse Width(PulseWidth)
• Data Quality Status(DataQualityStatus)
• Receiver Cal Check Time Stamp(CalCheckTime)
• Power (uncalibrated)(Power)